The August rate increase was designed to bring in an additional $95 million a year — a 3.3 percent increase. It’s not yet clear how long the requested rebate would last, or whether it might go up or down a year from now.

“APS customers would receive the credit on their monthly bill,” the company said in a statement yesterday, adding that the adjustment would need to be re-examined next year. “APS anticipates additional tax cut savings will be available at a later date once the full impact of the new law is realized.”